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In the figure, F acts on surface S to produce a traction T. As $\Delta S \to 0$, T approaches: 
A{'text': 'Infinity', 'label': 'C'}
B{'text': 'The stress vector at that point — dependent on the normal direction of the limiting surface', 'label': 'B'}
C{'text': 'Zero (force vanishes)', 'label': 'A'}
D{'text': 'The body weight', 'label': 'D'}
Answer & Solution
Correct answer: B. {'text': 'The stress vector at that point — dependent on the normal direction of the limiting surface', 'label': 'B'}
As the area shrinks to a point, T(n) becomes the STRESS VECTOR at that point ACTING ON A SURFACE WITH NORMAL n. The stress tensor σ relates all such stress vectors via T(n) = σ·n (Cauchy's stress theorem).
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